Could be the weight of the big cooler full of ice is just too much for the step down area and the whole thing is coming unglued. Can't say without getting a look underneath.
My Seafari's were both built different from the Septres, so I'm not the best guy to answer this kind of thing. But if you are planning a lot of weight in the step down area, I'd see if I couldn't tie the floor and sides of the step down into the stringers. They can't be far away. Whatever, you almost certainly need to cut some holes in the step down area.
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